Added a "Bake" profile option, in addition to "Leaded" and "Lead-free".

[HeaviDesign]

I added a "bake" option, so a person can now bake parts / PCBs to drive out moisture. It is a third option, and the display will show "BK". I didn't implement any sort of timer - it just goes to the desired bake temp and stays there. The only file changed is TinyReflowController.ino

[HeaviDesign]

This addresses the currently open "Issue 4".